RCA 6CW4 user manual

FOR TV AND FM
TUNER DESIGNS

RADIO CORPORATION OF AMERICA

ELECTRON TUBE DIVISION

HARRISON, N. J.

TRADEMARKS)-* REGISTERED MARCA(S) REGISTRADAS

PRINTED IN U.S.A.

Information furnished by RCA is believed to be accurate and re¬
liable. However, no responsibility is assumed by RCA for its use;
nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of RCA.

2CW4, 6CW4, 13CW4 11-62
Supersedes 2CW4, 6CW4 issue dated 7-62

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RCA-2CW4, 6CW4, 13CW4

High-Mu Nuvistor Triodes

RCA-2CW4, 6CW4, and 13CW4 are high-mu triodes of the nuvistor type,
intended for use as grounded-cathode, neutralized rf-amplifier tubes. The
2CW4 and 6CW4 are particularly useful in vhf tuners of television and FM
receivers. The 13CW4 is designed especially for use in antennaplex and
antenna-system booster amplifiers. In these applications the

a tubes provide exceptional performance in fringe areas and other
locations where signal levels are extremely weak. These
nuvistor triodes feature excellent signal power gain and a
noise factor significantly better than tubes currently in use
in such applications.

The high-gain and low-noise capabilities of these tubes are
achieved by very high transconductance and excellent transcon¬
duct ance - to -p la te -cu r rent ratio (12500 micromhos at a plate current of 7.2
milliamperes and a plate voltage of 70 volts).

The 2CW4, 6CW4, and 13CW4 nuvistor triodes, because of their unique
design, offer these additionaladvantages: extreme reliability; exceptional
uniformity of characteristics from tube to tube; very small size; and low
heater-power and plate-power requirements. All metal - and-ceramic con¬
struction insures ruggedness and long-term stability.

These nuvistors utilize the RCA Dark Heater to insure long life and
dependable performance. The heater of the 2CW4 has controlled warm-up time
for use in series heater-string arrangements.

GENERAL DATA

Electrical:

Heater, for Unipotential Cathode: 2CH4 6CW 4 i3CH4

Voltage (ac or dc).2.1 6.3 ±10% 13.5 ±10% volts

Current.0.45 ±6% 0.135 0.060 amp

Warm-up Time (Average). 8 - - seconds

Direct Interelectrode Capacitances (Approx.):

Grid to plate.0.92 pf

Grid to cathode, shell, and heater. 4.3 pf

Plate to cathode, shell, and heater ..1.8 pf

Plate to cathode.0. 18 pf

Heater to cathode. 1.6 pf

Characteristics, Class A| Amplifier;

Plate Supply Voltage. 110 volts

Grid Supply Voltage... 0 volts

Cathode Resistor. 130 ohms

Amplification Factor. 65

Plate Resistance (Approx.). 6600 ohms

Transconductance.. ... 9800 /xmhos

Plate Current. 7 ma

Grid Voltage (Approx.) for plate current = 10 /za. -4 volts

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2CW4, 6CW4, 13CW4

Meehanical:

Operating Position.

Maximum Over-all Length .

Maximum Seated Height .

Maximum Diameter.

Envelope.

Base.Medium Ceramic-Wafer Twelvar 5-Pin

.Any

. 0 . 8 "

.... 0.625"

.... 0.440"

. . Metal Shell
(JEDEC No.E5 -65)

Maximum Ratings, Design-Maximum Values:

PLATE SUPPLY^VOLTAGE . 300 (

PLATE VOLTAGE. 135

GRID VOLTAGE:

Negative-bias value . 55

Peak positive value . 0

PLATE DISSIPATION:

With a minimum series plate-circuit resistance

of 5000 ohms. 1.5

For lower values of series plate-circuit resistance . . . ,

max.
max.

max.
max.

volts

volts

vo 1 ts
volts

CATHODE CURRENT .

PEAK HEATER-CATHODE VOLTAGE:

Heater negative with respect to cathode
Heater positive with respect to cathode

Typical Operation:

Plate Voltage .

Grid Supply Voltage .

Grid Resistor .

Amplification Factor.

Plate Resistance (Approx.).

Transconductance.

Plate Current .

Maximum Circuit Values:

Grid-Circuit Resistance:*

For fixed-bias operation.

For cathode-bias operation.

max. watts
See Fig.I and
Operating Considerations
15

100

100

70

0

47000

68

5440

12500

7.2

0.5

2.2

max.

max.
max.

max.
max.

volts

volts

volts

volts

ohms

ohms

/imhos

ma

megohm

megohms

A plate supply voltage of 300 volts may be used provided sufficient plate-circuit re¬
sistance and age voltage are used to limit the voltage at the plate of the tube to 135
volts under conditions of maximum rated plate dissipation (1.5 watts).

* For operation at metal-shell temperatures up to 135° C.

OPERATING CONSIDERATIONS

The base pins of the 2CW4, 6CW4, and 13CW4 fit the Cinch Manufacturing
Co. socket No.133 65 10 001 and the Industrial Electronic Hardware Co.
socket Nos.Nu 5044 and Nu 5060, or their equivalents.

In some previous publications reference has been made to a JEDEC
No.E5-65 socket. This number is not a socket designation but is a base
designation which defines the JEDEC Medium Ceramic-Wafer Twelvar 5-pin base
used in nuvistor tubes.

Use of Plate-Dissipation Rating Chart

The Plat e-Di s s ipat ion Rat ing Char t shown in Fig. 1 presents graphical ly the
maximum rated plate dissipation of the 2CW4, 6CW4, and13CW4 for various minimum

- 4 .

2CW4, 6CW4, 13CW4

values of series p1 ate-circuit resistance. The region of permissible oper¬
ation is bounded by the lines representing plate dissipation = 1.5 watts,
plate voltage = 135 volts, and plate current = 15 mi 1liamperes. In class
Al amplifier service, because no grid current flows, the plate current rating
is equivalent to the cathode current rating.

To determine the required minimum series p1 ate-circuit resistance for
a given set of operating conditions:

1. From Fig.2, Average Plate Characteristics, select the desired oper¬
ating conditions.

2. From Fig.1 determine the corresponding maximum plate dissipation and
required minimum value of series plate-circuit resistance.

Example: (a) From Fig.2 — for a plate voltage of 130 volts and a grid
voltage of -1 volt, the corresponding plate current is 10.5 mi 11iamperes.

(b) From Fig.1 — the plate dissipation for a plate voltage
of 130 volts and a plate current of 10.5 milliamperes is approximately1.37
watts. The required minimum series plate-circuit resistance for this plate
dissipation is 3700 ohms.

Fig.l -Plate-Dissipation Rating Chart
for Types 2CWA. 6CWA, and!3CW/i.

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Fig.2 -Average Plate Characteristics
for Type 6CWA and for Types 2CH4 and
13CW4 Except for Heater Voltage.

PLATE RESISTANCE (rj — MEGOHMS

2CW4, 6CW4, 13CW4

DIMENSIONAL OUTLINE

|*-,400"MAX. DIA.-*|

BASE

JEDEC N2E5-65

.100 MIN,
.130* MAX.

zrv i.

ZONE v A y
(NOTE 2)

. DIA.—►

5 PINS

,016"± .001" DIA.

-.435 MAX.
(NOTE I)

0 '2

°4 „ °2

7. 6 ,

.3 ' 6 J

* = SHORT PIN-INTERNAL
CONNECTION-DO NOT USE

CERAMIC

/WAFER

92C5-I0970R2

Fig.3 -Average Characteristics for
Type hC'fik and for Types 2CH4 and
13CW4 Except for Heater Voltage.

NOTE I: MAXIMUM 0.0. OF 0.440" IS PERMITTED
ALONG 0.190" LUG LENGTH.

NOTE 2: SHELL TEMPERATURE SHOULD BEMEASURED
IN ZONE ‘A’.

BASING DIAGRAM
(Bottom View)

ARRANGEMENT OF BASE PINS

PIN

1:

•

P 1 N

7 :

•

P 1 N

2:

PLATE

5.ii /•—rvfi.,b

PIN

B:

CATHODE

PIN

3:

•

1 j \ \

PIN

9:

•

PIN

u:

GRID

| | | | ( 'y -’1/ j ] 11J

PIN

10:

HEATER

PIN

5:

•

' • 1 ‘'

PI N

n:

OMITTED

PIN

6:

•

PIN

12:

HEATER

SMALL LUS

i DEX = LARGE LUG

= SHORT PIN—INTERNAL
CONNECT I ON —DO NOT USE

2CW4, 6CW4, 13CW4

JEDEC No. NAME PINS

E12-64 L2-Pin Base 1,2, 3, 4,5,6,7,8 ,

9,10,11,12

E5-65 5-Pin Base 2,4,8,10,12,

(Note 2)

Note I : Maximum O.D. of 0.440" is permitted along the
0. 190" lug length.

Note 2; Pins 1,3,5,6,7, and 9 are of a length such that
their ends do not touch the socket insertion plane.
Pin 11 is omitted.

PIN-ALIGNMENT GAUGE

Base-pin positions and lug positions shall be held to
tolerances such that entire length of pins and lugs will
without undue force pass into and disengage from flat-
plate gauge having thickness of 0.25" and twelve holes of
0.0350" ± 0.0005" diameter located on four concentric
circles as follows: Three holes located on 0.2800" ±
0.0005 ", three holes located on 0.2100" ± 0.0005 ", three
holes located on 0.1400" ± 0.0005", three holes located
on 0.0700’ ± 0.0005" diameter circles at specified angles
with a tolerance of ± 0.08° for each angle. In addition,
gauge provides for two curved slots with chordal lengths
of 0.2270" ± 0,0005" and 0.1450" 1 0.0005" located on
0.4200" ± 0.0005’ diameter circle concentric with pin
circles at 180° ± 0.08° and having a width of 0.0230"
± 0.0005 ".

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